I have a 8600 gvw truck with 8 lug rotors that are splined to the hub. There are no holes in the rotor to force the rotor from the hub backing plate,,,how to I remove the rotor other than cutting it in half with a grinder? The rotor looks good except for a crack in the facing. I tried heating with a MAPP torch and penetrating oil and was able to crack the rust caked around the studs but it still seems stuck on the hub spline.